jbrodkin writes "For cloud customers willing to pony up a little extra cash, Amazon has an enticing proposition: Spread your application across multiple availability zones for a near-guarantee that it won't suffer from downtime. 'By launching instances in separate Availability Zones, you can protect your applications from failure of a single location,' Amazon says in pitching its Elastic Compute Cloud service. But the availability zones are close together and can fail at the same time, as we saw today. The outage and ongoing attempts to restore service call into question the effectiveness of the availability zones, and put a spotlight on Amazon's failure to provide load balancing between the east and west coasts."
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